app-MAIL-temp/app/email/rate_limit.py

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import arrow
from app.alias_utils import try_auto_create
from app.config import (
MAX_ACTIVITY_DURING_MINUTE_PER_ALIAS,
MAX_ACTIVITY_DURING_MINUTE_PER_MAILBOX,
)
from app.db import Session
from app.email_utils import is_reverse_alias
from app.log import LOG
from app.models import Alias, EmailLog, Contact
def rate_limited_for_alias(alias: Alias) -> bool:
min_time = arrow.now().shift(minutes=-1)
# get the nb of activity on this alias
nb_activity = (
Session.query(EmailLog)
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.join(Contact, EmailLog.contact_id == Contact.id)
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.filter(
Contact.alias_id == alias.id,
EmailLog.created_at > min_time,
)
.group_by(EmailLog.id)
.count()
)
if nb_activity > MAX_ACTIVITY_DURING_MINUTE_PER_ALIAS:
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LOG.w(
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"Too much forward on alias %s. Nb Activity %s",
alias,
nb_activity,
)
return True
return False
def rate_limited_for_mailbox(alias: Alias) -> bool:
min_time = arrow.now().shift(minutes=-1)
# get nb of activity on this mailbox
nb_activity = (
Session.query(EmailLog)
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.join(Contact, EmailLog.contact_id == Contact.id)
.join(Alias, Contact.alias_id == Alias.id)
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.filter(
Alias.mailbox_id == alias.mailbox_id,
EmailLog.created_at > min_time,
)
.group_by(EmailLog.id)
.count()
)
if nb_activity > MAX_ACTIVITY_DURING_MINUTE_PER_MAILBOX:
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LOG.w(
"Too much forward on mailbox %s, alias %s. Nb Activity %s",
alias.mailbox,
alias,
nb_activity,
)
return True
return False
def rate_limited_forward_phase(alias_address: str) -> bool:
alias = Alias.get_by(email=alias_address)
if alias:
return rate_limited_for_alias(alias) or rate_limited_for_mailbox(alias)
else:
LOG.d(
"alias %s not exist. Try to see if it can be created on the fly",
alias_address,
)
alias = try_auto_create(alias_address)
if alias:
return rate_limited_for_mailbox(alias)
return False
def rate_limited_reply_phase(reply_email: str) -> bool:
contact = Contact.get_by(reply_email=reply_email)
if not contact:
return False
alias = contact.alias
return rate_limited_for_alias(alias) or rate_limited_for_mailbox(alias)
def rate_limited(mail_from: str, rcpt_tos: [str]) -> bool:
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# todo: re-enable rate limiting
return False
for rcpt_to in rcpt_tos:
if is_reverse_alias(rcpt_to):
if rate_limited_reply_phase(rcpt_to):
return True
else:
# Forward phase
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address = rcpt_to # alias@SL
if rate_limited_forward_phase(address):
return True
return False